const arr = ["1"];
const proxy = new Proxy(arr, {});

const log = console.log;

log("__proto__:", proxy.__proto__ === Array.prototype); // __proto__: true
log("instanceof:", proxy instanceof Array); // instanceof: true

console.log("-------------------");
log("toString", Object.prototype.toString.call(Proxy)); // toString [object Function]

log("Proxy.prototype:", Proxy.prototype); // Proxy.prototype: undefined

log("proxy instanceof Proxy:", proxy instanceof Proxy); // 报错
